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Freebase(0.00 / 0 votes)Rate this definition: Log flume. A log flume is a flume specifically constructed to transport lumber and logs down mountainous terrain to a sawmill by using flowing water. These watertight trough-like channels could be built to span a long distance across chasms and down steep mountain slopes.
A flume is a human-made channel for water in the form of an open declined gravity chute whose walls are raised above the surrounding terrain, in contrast to a trench or ditch.[1][2] Flumes are not to be confused with aqueducts, which are built to transport water, rather than transporting materials using flowing water as a flume does.[citation needed ...